subcallosal

Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

adj. Beneath the corpus callosum

from The Century Dictionary and Cyclopedia

Situated beneath the corpus callosum.

Etymologies

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Examples

The fibers of the medial olfactory striæ terminate for the most part in the parolfactory area (Brocas area), a few end in the subcallosal gyrus and a few in the anterior perforated substance and the adjoining part of the septum pellucidum.

The medial stria turns medialward behind the parolfactory area and ends in the subcallosal gyrus; in some cases a small intermediate stria is seen running backward to the anterior perforated substance.

Zuckerkandl describes an olfactory fasciculus which becomes detached from the main portion of the column of the fornix, and passes downward in front of the anterior commissure to the base of the brain, where it divides into two bundles, one joining the medial stria of the olfactory tract; the other joins the subcallosal gyrus, and through it reaches the hippocampal gyrus.

The thickened edge of gray substance becomes the gyrus dentatus, the fasciola cinerea and the supra - and subcallosal gyri, while the free edge of the white substance forms the fimbria hippocampi and the body and crus of the fornix.

(d) The parolfactory area of Broca (area parolfactoria) is a small triangular field on the medial surface of the hemisphere in front of the subcallosal gyrus, from which it is separated by the posterior parolfactory sulcus; it is continuous below with the olfactory trigone, and above and in front with the cingulate gyrus; it is limited anteriorly by the anterior parolfactory sulcus.

(a) The subcallosal gyrus (gyrus subcallosus; peduncle of the corpus callosum) is a narrow lamina on the medial surface of the hemisphere in front of the lamina terminalis, behind the parolfactory area, and below the rostrum of the corpus callosum.

(e) The anterior perforated substance (substantia perforata anterior) is an irregularly quadrilateral area in front of the optic tract and behind the olfactory trigone, from which it is separated by the fissure prima; medially and in front it is continuous with the subcallosal gyrus; laterally it is bounded by the lateral stria of the olfactory tract and is continued into the uncus.